????????
      ----------
YEEHP ) PMRQEWHP
       -WRXQN
        =====
        RTRXUW
       -RHPPNN
        ======
         YNYMYH
        -YUQQUN
         ======
          RYQRRP
         -RUURMP
          ======
          ??????

base: 12
symbols: EHMNPQRTUWXY
difficulty: medium